151
FXUS66 KPDT 062240
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
240 PM PST Sat Dec 6 2025

.DISCUSSION...

Key Points:

1. Wet pattern continues through the weekend

2. Winds will return Monday night into Tuesday

3. Continued wet pattern with increasing temperatures

Winds are still a bit breezy across some areas across the CWA, but
remain below advisory criteria. Current radar shows some linger
showers continuing over the crests of the Cascades with little spill
over to the eastern slopes. Current satellite imagery shows the cast
majority of the area to be partly to mostly sunny. However, the
sunshine will be short lived as the next incoming round of
precipitation makes its way into the region tonight.

Tonight through Monday...Partly to mostly sunny skies will give away
to mostly cloudy and overcast as we continue to move through the
evening and into the overnight period. Precipitation will be pinned
to the Blues and the Cascades to start but will become widespread
this after 4AM. Models show QPF amounts to be elevated along the
higher elevations and along the eastern slopes before tapering of
slightly as we head towards the eastern portion of the CWA. Models
show rain to be continuous through Sunday with 24 hour precipitation
totals nearing wetting rain amounts of near 0.10-0.20 across
portions of the Basin, foothills of the N & S Blues and through
north central OR (70-90%). The eastern mountains, Highlands and
eastern slopes will see between 0.30 inches along the lower slopes
(60-80%) to near 1 inch around the crests (70-90%). Models are firm
agreement with yet another round of frontal systems impacting the
NW. Monday will be another soggy day with models showing even higher
amounts of precipitation, especially along the foothills of the
Blues and eastern slopes of the Cascades. 70-90% of the raw
ensembles show the crests of the Cascades could see nearly 2-3
inches of rainfall in 24 hours Monday. 30-50% for 0.90-1.20 inches
along the crests of the Blues and 70-90% for 0.10-0.20 inches
elsewhere.

Not only will Monday bring another round of wetting rains, but also
another round of breezy to windy conditions across the region Monday
night. Raw ensembles show the primary locations of sustained winds
of 30-35 to be along the Simcoe Highlands, foothills of the southern
Blues (40-60%) and the foothills of the N. Blues of WA (70-90%). The
associated gusts will be highest along the ridgetops of the
aforementioned areas with raw ensembles showing (70-90% confidence)
in the aforementioned areas seeing gusts of 40-45mph. This is below
wind advisory criteria at this time and will be closely monitored as
Monday draws nearer.

Tuesday onwards...Models continue to be in agreement with a
significant amount of rainfall expected over the course of the week.
NBM QPF amounts are relatively high, especially across the mountain
tops. Models even show the lower elevations could see near 0.15-0.25
inches of rain Tuesday (45-70%), (50-70%) again Wednesday before
tapering off to 0.05-0.1 inches Thursday. As for the mountains, raw
ensembles show (70-90%) for 1 inch or more Tuesday, (60-80%)
Wednesday and (50-70%) Thursday. Through the bulk of the next week,
snow levels are then forecast to remain high at mostly 5-8 kft with
periodic dips to 4.5 kft so much of the precipitation expected will
indeed fall as rain. With that in mind there are some concerns about
rises on area rivers. Current forecasts from the NWRFC in Portland
do place multiple rivers at action stage or minor flood stage by the
latter half of next week. 90


&&

.AVIATION...00Z TAFS...Mostly VFR conditions forecast through the
period. CIGs and vsby will stay VFR through late this evening and
early tonight, but an incoming system will bring lowering CIGS of
sct to ovc down to around 2kft to 6kft by tomorrow morning at all
sites. Precipitation associated with the incoming system will
start around 10Z for RDM/BDN/DLS but be fairly light at sites
RDM/BDN, and between 13Z-15Z for sites PDT/YKM/ALW/PSC. Heavier
precip at site DLS may reduce vsby to 3 to 5 miles. Precipitation
will last for several hours at each site with end times around 15Z
at sites RDM/BDN, and 18-20Z at sites DLS/PDT/YKM/PSC. Site ALW
will see light rain impacts persist after 18Z. Breezy winds will
continue into the early evening, then become 12kts or less
through the remainder of the period...except at sites BDN/ALW
where winds 12-17kts with gusts to around 25kts will redevelop
around or after 15Z(BDN) and 18Z(DLS). Lawhorn/82


&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  54  43  58 /  30  90  60  80
ALW  42  51  45  57 /  40  90  70  90
PSC  42  56  44  59 /  20  80  30  70
YKM  36  53  37  55 /  30  80  30  80
HRI  42  56  43  60 /  20  90  40  70
ELN  34  47  34  49 /  40  80  40  80
RDM  33  55  37  57 /  30  50  40  50
LGD  35  45  38  49 /  60  90  80  90
GCD  34  48  38  52 /  40  90  50  70
DLS  46  56  47  60 /  80 100  80  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.
&&

$$

DISCUSSION...90
AVIATION...82